Control method and control device for starting white balance adjustment

Abstract

The invention discloses a control method and a control device for starting white balance adjustment. The invention utilizes a motion detection to obtain background areas of two continuous frame images, respectively calculates colourity average value of the background areas in the two continuous frame images; if the difference of the colourity average value of the background areas in the two continuous frame images is larger than or equal to a preset first threshold value, the colourity average value of the background areas in the two continuous frame images changes obviously is shown; the colourity average value of the background areas in the two continuous frame images is generally influenced only by actual light source property, thus being capable of judging that the actual light sourceproperty changes and triggering the starting of the white balance adjustment. Therefore, when a moving object in the image has influence on the colourity average value of the whole frame image, misjudgment whether the actual light source property changes can be avoided, thus being capable of avoiding triggering the white balance adjustment when the color temperature of the actual light source doesnot change, also being capable of avoiding that the white balance adjustment is not triggered when the color temperature of the actual light source changes. Therefore, the invention can improve the reliability of the white balance adjustment.

Description

technical field [0001] The present invention relates to control technology, in particular to a control method for starting white balance adjustment and a control device for starting white balance adjustment. Background technique [0002] White balance adjustment refers to adjusting the chromaticity of the whole frame image based on the white color when the sunlight is used as the light source, and according to the deviation of the actual light source characteristics such as color temperature from the reference, so as to improve the image quality. [0003] In the prior art, it is usually judged whether the actual light source property changes by using the chromaticity average value of the whole frame of images. Every frame of image needs to start white balance adjustment. [0004] However, the change in the average chromaticity of the entire frame of image is not necessarily caused by the change of the actual light source properties; and even if the actual light source prope...

AI Technical Summary

Problems solved by technology

[0007] It can be seen that the existing technology judges whether the properties of the actual light source have changed based on the average chromaticity of the entire frame of the image, while ignoring other factors that cause the average chromaticity to change. Therefore, it is impossible to accurately determine whether to start white balance adjustment, reducing the Improved reliability of white balance adjustment for image quality improvement

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